TreeList Data Binding to Interface

Updated on Oct 1, 2026

Since version 2.27, the TreeList supports binding to a collection of multiple model types that implement the same interface.

Note the usage of OnModelInit in the example below. The event handler sets the model type to be used for new items in the TreeList. One-type model creation is supported out-of-the-box. If you need to support adding instances of different types:

• Use custom Add buttons in the TreeList Toolbar, one for each model type.
• In each button click handler, define an InsertedItem of the correct type in the TreeList State.
• Put the TreeList in Insert mode with the SetStateAsync method.

Data Binding the TreeList to an Interface

Example

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Up to version 2.26, the Data collection of the TreeList must contain instances of only one model type.

See Also

• Binding to Flat Data
• Binding to Hierarchical Data
• Load on Demand
• Live Demo: TreeList Flat Data
• Live Demo: TreeList Hierarchical Data
• Live Demo: TreeList Load on Demand